How to Determine Forces in Members BC and CG Using the Section Method?

[J-dizzal]

Homework Statement

Determine the forces in members BC and CG. The forces are positive if in tension, negative if in compression.[/B]

Homework Equations

ΣF=0
ΣM=0

The Attempt at a Solution

I don't know where I am going wrong, My equations include the applied force, since there is only one.

 

[J-dizzal]

solved. I had some signs wrong and copied down 76 insted of 78.